US7730603B2 - Methods for forming a magnet in a rotor - Google Patents
Methods for forming a magnet in a rotor Download PDFInfo
- Publication number
- US7730603B2 US7730603B2 US11/736,671 US73667107A US7730603B2 US 7730603 B2 US7730603 B2 US 7730603B2 US 73667107 A US73667107 A US 73667107A US 7730603 B2 US7730603 B2 US 7730603B2
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- particles
- rotor
- aperture
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/08—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/083—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together in a bonding agent
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
- H01F1/11—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
- H01F1/113—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0273—Imparting anisotropy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49009—Dynamoelectric machine
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49009—Dynamoelectric machine
- Y10T29/49012—Rotor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49803—Magnetically shaping
Definitions
- the present invention generally relates to electric motors, and more particularly relates to methods for forming magnets in motor rotors.
- FIG. 1 is a simplified diagram of a prior art electric motor 100 including an axle 140 around which a rotor 110 rotates, and also including brushes 154 and 158 connected to a power source 160 to provide power to rotor 110 .
- rotor 110 is surrounded by a field magnet 120 having a “north pole” 124 and a “south pole” 128 on opposite sides of rotor 110 .
- rotor 110 typically includes a magnetic orientation (i.e., north pole and south pole) that changes at a pre-determined position when power is supplied to brushes 154 and 158 .
- rotor 110 includes a magnetic orientation that changes as rotor 110 rotates such that a “north pole” is always above a horizontal position 130 .
- the changing “north pole” of rotor 110 is attracted to south pole 128 and repelled by north pole 124 , which in this example, results in a clockwise rotation around axle 140 .
- magnets are commonly bonded to the surface of rotor 110 .
- Various exemplary embodiments of the invention provide methods for forming a magnet in a rotor.
- One embodiment includes inserting a plurality of magnetizable particles in a rotor, coating the particles with a non-metallic material, and magnetizing the particles.
- Another embodiment includes inserting a plurality of magnetizable particles into a rotor, submersing the rotor in motor varnish to coat the particles with motor varnish, and magnetizing the particles.
- Yet another embodiment includes inserting a plurality of magnetizable particles in a rotor, inserting a non-metallic material into the rotor, mixing the particles and non-metallic material to form a mixture, curing the mixture such that each magnetizable particle is coated with non-metallic material, and magnetizing the coated particles.
- Still another embodiment includes mixing a plurality of magnetizable particles with a non-metallic material to form a mixture, inserting the mixture in a rotor, curing the mixture to coat each particle with non-metallic material,
- FIG. 1 is a diagram representing a prior art electric motor
- FIGS. 2A and 2B are top views of a diagram of one exemplary embodiment of a rotor during formation of at least one magnet embedded within the rotor;
- FIG. 3 is a flow diagram representing one exemplary embodiment of a method for forming a magnet within a rotor
- FIG. 4 is a flow diagram representing another exemplary embodiment of a method for forming a magnet embedded within a rotor
- FIG. 5 is a flow diagram representing yet another exemplary embodiment of a method for forming a magnet within a rotor.
- FIG. 6 is a flow diagram representing still another exemplary embodiment of a method for forming a magnet within a rotor.
- FIG. 2A is a top view of a diagram of one exemplary embodiment of a rotor 200 during formation of a magnet (shown in FIG. 3 ) embedded within rotor 200 .
- Rotor 200 includes a main portion 210 including an aperture 215 for receiving an axle (not shown) and one or more apertures 220 within which a magnet is embedded and/or formed.
- Each aperture 220 is shaped such that the magnetic orientation of rotor 200 changes as rotor 200 rotates around the axle.
- each aperture 220 is configured to house a magnet, particles of a magnetizable material (e.g., neodymium-iron-boron, ferrite, and samarium-cobalt, and the like materials), and/or a mixture of magnetizable particles and a non-metallic material (e.g., an adhesive, a polyurethane material, an epoxy, a B-staged adhesive, motor varnish, and the like) that extends either completely through or partially through main portion 210 .
- each aperture 220 is configured to enable any magnetizable particles and/or mixtures including magnetizable particles to be magnetized when contained within aperture(s) 220 .
- FIG. 2B is a diagram of rotor 200 including magnets 225 formed of magnetized particles coated with non-metallic material substantially filling each aperture 220 .
- Magnet(s) 225 are formed by coating the magnetizable particles with non-metallic material and magnetizing the particles, which coating and/or magnetizing may be performed either outside of or within aperture(s) 220 .
- the non-metallic material may be treated (e.g., cured and/or evacuated) so that the particles are more uniformly coated and/or to ensure each particle is separated from its neighboring particle(s) by the non-metallic material. Accordingly, the non-metallic material should be strong enough to resist particle migration caused by the attraction/repulsion of the particles to one another.
- each particle when the particles, either alone or within a mixture, are magnetized, the polarity of each particle is oriented in substantially the same direction with respect to one another. For example, each north pole and south pole of each magnetized particle is “pointed” in substantially the same direction.
- each magnet 225 When magnet(s) 225 are formed outside of aperture(s) 220 , each magnet 225 is subsequently inserted into a respective aperture 220 . Accordingly, the dimensions of each magnet 225 should be slightly smaller than the dimensions of its corresponding aperture 220 to account for the needed clearance space. This is not the case when a magnet 225 is formed within an aperture 220 since the particles and non-metallic material may be individually inserted (e.g., manually, injection molded, etc.), mixed/coated, cured, and/or magnetized within each aperture 220 .
- FIG. 3 is a flow diagram representing one exemplary embodiment of a method 300 for forming a magnet (e.g., magnet 225 ) embedded within a rotor (e.g., rotor 200 ).
- Method 300 begins by coating particles of a magnetizable material (e.g., neodymium-iron-boron, ferrite, and samarium-cobalt, and the like materials) having a size in the range of about 20 microns to about 1000 microns with a non-metallic material (e.g., an adhesive (e.g., a B-staged adhesive), a polyurethane material, an epoxy, motor varnish, and the like) (step 310 ).
- a magnetizable material e.g., neodymium-iron-boron, ferrite, and samarium-cobalt, and the like materials
- a non-metallic material e.g., an adhesive (e.g., a B-
- coating methods include, but are not limited to, spraying the non-metallic material on the particles, attracting the non-metallic material to the particles by electrostatic processes, combining the particles with a liquid/semi-liquid pool of non-metallic material, and/or other methods capable of coating a magnetizable material with a non-metallic material.
- the coated particles are inserted/embedded (e.g., manually, utilizing injection molding techniques, etc.) into at least one aperture (e.g., aperture 220 ) of rotor 200 (step 320 ) and magnetized to form coated magnetized particles (step 330 ).
- the north pole and south pole of each particle is oriented in substantially the same direction.
- the coated particles may be magnetized before and/or after insertion into aperture(s) 220 . Moreover, the particles may be coated with non-metallic material after insertion into aperture(s) 220 .
- the non-metallic material may be cured (step 340 ).
- methods to cure the coated particles include, but are not limited to, heat treating the coated particles to the melting point of the non-metallic material, solvent curing, catalyst curing, and/or other methods capable of more uniformly coating the particles and/or ensuring that the particles are not in contact with one another.
- air may be evacuated from the non-metallic material utilizing, for example, vacuum techniques or other processes capable of removing air from a liquid or semi-liquid material (step 350 ).
- steps 310 through 350 may occur in any order. Moreover, any one of steps 310 through 350 may be repeated multiple times.
- FIG. 4 is a flow diagram representing another exemplary embodiment of a method 400 for forming a magnet (e.g., magnet 225 ) in a rotor (e.g., rotor 200 ).
- Method 400 begins by inserting (e.g., manually, injection molding, etc.) particles having a size in the range of about 20 microns to about 1000 microns of a magnetic material (e.g., neodymium-iron-boron, ferrite, and samarium-cobalt, and the like materials) into an aperture (e.g., aperture 220 ) of rotor 200 (step 410 ).
- a magnetic material e.g., neodymium-iron-boron, ferrite, and samarium-cobalt, and the like materials
- rotor 200 is submersed (“dipped”) in motor varnish to coat the particles with motor varnish (step 420 ).
- the coated particles are then magnetized while housed within aperture 220 (step 430 ).
- the north and south poles of each particle are oriented in substantially the same direction when the coated particles are magnetized.
- Method 400 also includes curing (e.g., vacuum curing) the coated particles to more uniformly coat the particles and/or to ensure that the particles are separated from one another by the motor varnish (step 440 ).
- the coated particles may be cured either before and/or after the magnetizing step (i.e., step 430 ).
- the invention contemplates that the particles may be coated with any viscous, non-metallic material capable of coating the particles such that, when coated, the particles are not in direct contact with one another.
- FIG. 5 is a flow diagram representing yet another exemplary embodiment of a method 500 for forming a magnet (e.g., magnet 225 ) within a rotor (e.g., rotor 200 ).
- Method 500 begins by inserting (e.g., manually, injection molding, etc.) particles having a size in the range of about 20 microns to about 1000 microns of a magnetic material (e.g., neodymium-iron-boron, ferrite, and samarium-cobalt, and the like materials) into an aperture (e.g., aperture 220 ) of rotor 200 (step 510 ).
- a magnetic material e.g., neodymium-iron-boron, ferrite, and samarium-cobalt, and the like materials
- a non-metallic material e.g., an adhesive (e.g., a B-staged adhesive), a polyurethane material, an epoxy, motor varnish, and the like
- an adhesive e.g., a B-staged adhesive
- a polyurethane material e.g., an epoxy, motor varnish, and the like
- aperture 220 e.g., manually, injection molding, etc.
- the particles and non-metallic material is mixed in aperture 220 to form a mixture of at least partially coated particles (step 530 ), and the mixture is cured (e.g., heat curing, solvent curing, catalyst curing, etc.) to separate the particles from one another and/or to coat the particles with non-metallic material (step 540 ).
- the partially coated and/or coated particles are then magnetized in aperture 220 (step 550 ).
- FIG. 6 is a flow diagram representing still another exemplary embodiment of a method 600 for forming a magnet (e.g., magnet 225 ) within a rotor (e.g., rotor 200 ).
- method 600 includes mixing particles having a size in the range of about 20 microns to about 1000 microns of a magnetic material (e.g., neodymium-iron-boron, ferrite, and samarium-cobalt, and the like materials) with a non-metallic material (e.g., an adhesive (e.g., a B-staged adhesive), a polyurethane material, an epoxy, motor varnish, and the like) is also inserted (e.g., manually, injection molding, etc.) (step 610 ).
- a magnetic material e.g., neodymium-iron-boron, ferrite, and samarium-cobalt, and the like materials
- a non-metallic material e.g., an
- the non-metallic material is then cured (e.g., heat curing, solvent curing, catalyst curing, etc.) to coat each particle with non-metallic material (step 620 ).
- cured e.g., heat curing, solvent curing, catalyst curing, etc.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
Description
Claims (10)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/736,671 US7730603B2 (en) | 2007-04-18 | 2007-04-18 | Methods for forming a magnet in a rotor |
DE102008018948A DE102008018948A1 (en) | 2007-04-18 | 2008-04-15 | Method for forming a magnet in a rotor |
CN2008100933431A CN101291093B (en) | 2007-04-18 | 2008-04-18 | Method for forming magnet in rotor |
US12/763,494 US8613131B2 (en) | 2007-04-18 | 2010-04-20 | Methods for forming a magnet in a rotor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/736,671 US7730603B2 (en) | 2007-04-18 | 2007-04-18 | Methods for forming a magnet in a rotor |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/763,494 Division US8613131B2 (en) | 2007-04-18 | 2010-04-20 | Methods for forming a magnet in a rotor |
Publications (2)
Publication Number | Publication Date |
---|---|
US20080256782A1 US20080256782A1 (en) | 2008-10-23 |
US7730603B2 true US7730603B2 (en) | 2010-06-08 |
Family
ID=39868977
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/736,671 Active 2027-07-02 US7730603B2 (en) | 2007-04-18 | 2007-04-18 | Methods for forming a magnet in a rotor |
US12/763,494 Active 2029-09-28 US8613131B2 (en) | 2007-04-18 | 2010-04-20 | Methods for forming a magnet in a rotor |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US12/763,494 Active 2029-09-28 US8613131B2 (en) | 2007-04-18 | 2010-04-20 | Methods for forming a magnet in a rotor |
Country Status (3)
Country | Link |
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US (2) | US7730603B2 (en) |
CN (1) | CN101291093B (en) |
DE (1) | DE102008018948A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100300641A1 (en) * | 2008-05-02 | 2010-12-02 | Purohit Madhur M | Power tool having an electronically commutated motor and double insulation |
US20140217848A1 (en) * | 2013-02-07 | 2014-08-07 | GM Global Technology Operations LLC | Interior permanent magnet machine |
US20160344274A1 (en) * | 2015-05-18 | 2016-11-24 | GM Global Technology Operations LLC | Pole to pole variation in shape of injection molded magnets of internal permanent magnet machines |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8174158B2 (en) * | 2009-02-20 | 2012-05-08 | GM Global Technology Operations LLC | Methods and apparatus for a permanent magnet machine with asymmetrical rotor magnets |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2648609A (en) * | 1949-01-21 | 1953-08-11 | Wisconsin Alumni Res Found | Method of applying coatings to edible tablets or the like |
US6509667B1 (en) * | 2000-09-08 | 2003-01-21 | Delphi Technologies, Inc. | Rotor for a reluctance motor |
US6684483B2 (en) * | 2001-09-14 | 2004-02-03 | General Motors Corporation | Method of fabricating a rotor for an electric traction motor |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5898253A (en) * | 1993-11-18 | 1999-04-27 | General Motors Corporation | Grain oriented composite soft magnetic structure |
JP2002010547A (en) | 2000-06-16 | 2002-01-11 | Yamaha Motor Co Ltd | Permanent magnet rotor and manufacturing method thereof |
JP2002015912A (en) | 2000-06-30 | 2002-01-18 | Tdk Corp | Dust core powder and dust core |
US6703746B2 (en) * | 2002-03-01 | 2004-03-09 | General Motors Corporation | Interior permanent magnet rotor |
-
2007
- 2007-04-18 US US11/736,671 patent/US7730603B2/en active Active
-
2008
- 2008-04-15 DE DE102008018948A patent/DE102008018948A1/en active Pending
- 2008-04-18 CN CN2008100933431A patent/CN101291093B/en active Active
-
2010
- 2010-04-20 US US12/763,494 patent/US8613131B2/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2648609A (en) * | 1949-01-21 | 1953-08-11 | Wisconsin Alumni Res Found | Method of applying coatings to edible tablets or the like |
US6509667B1 (en) * | 2000-09-08 | 2003-01-21 | Delphi Technologies, Inc. | Rotor for a reluctance motor |
US6684483B2 (en) * | 2001-09-14 | 2004-02-03 | General Motors Corporation | Method of fabricating a rotor for an electric traction motor |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100300641A1 (en) * | 2008-05-02 | 2010-12-02 | Purohit Madhur M | Power tool having an electronically commutated motor and double insulation |
US20140217848A1 (en) * | 2013-02-07 | 2014-08-07 | GM Global Technology Operations LLC | Interior permanent magnet machine |
US9118230B2 (en) * | 2013-02-07 | 2015-08-25 | GM Global Technology Operations LLC | Interior permanent magnet machine |
US20160344274A1 (en) * | 2015-05-18 | 2016-11-24 | GM Global Technology Operations LLC | Pole to pole variation in shape of injection molded magnets of internal permanent magnet machines |
US9899902B2 (en) * | 2015-05-18 | 2018-02-20 | GM Global Technology Operations LLC | Pole to pole variation in shape of injection molded magnets of internal permanent magnet machines |
Also Published As
Publication number | Publication date |
---|---|
US20100199489A1 (en) | 2010-08-12 |
DE102008018948A1 (en) | 2008-11-20 |
US20080256782A1 (en) | 2008-10-23 |
CN101291093A (en) | 2008-10-22 |
US8613131B2 (en) | 2013-12-24 |
CN101291093B (en) | 2011-08-17 |
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